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 Features:
· Patented Plunger pH Electrode
· Choice of High Temperature, High pH or ORP Measurement
· Patented Porous Teflon Liquid Junctions
· Double Junction Reference Cell
· New Cast-In-Place Solid Reference Electrolyte
· Optional Integral Unity Gain Preamplifier
· New TOP68 Quick Disconnect Cable
· New Capillary TC Design
· New Non-Metallic Solution Ground
 Applications:
· Water and Wastewater Treatment
· Coagulation and Flocculation
· Process Monitoring and Control
· Acid / Caustic Neutralization
· Plant Effluent
Description:
The
Model 21 process pH sensor features
the Plunger pH electrode design, which permits 360° sensor
mounting. The porous Teflon liquid junction resists fouling
and chemical attack. Double junction reference cells increase
the service life in applications containing sulfides (H2S) and
metals such as lead, mercury and silver. The new cast-in-place
solid reference electrolyte helps maintain a constant reference
cell potential by resisting dilution over time with pressure
and temperature changes. The new capillary temperature sensor
design places the Pt100 or Pt1000 TC behind the pH sensitive
membrane for accurate temperature compensation and measurement.
The TOP68 quick disconnect cable system provides ease of use
and the reliability of fixed cable. The IP68 environmental rating
protects the high impedance pH electrode signal from moisture
resulting from condensate build up in submersion pipes.
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